I saw a couple large trees blow down in a windstorm once in the BWCA. Since then, I tend to look for somewhat smaller trees to hang from. I suppose any tree can blow down, but those big trees with shallow root systems seem more likely to go. Does anyone else consider this when picking trees? I know, often there aren't a lot of great hanging spots, but it's something I consider.
I've used trees as little as 3-4" in diameter. It was the only thing available at the time. If you ever have to use trees this small, set your hammock up a little tighter than normal and allow for a little 'bend factor".
mostly and more importantly, it's not so much about the size of tree, but the health and overhead situation of possible cracks, dead zones and branches.
I love the smell of silnylon in the morning. It smells like........victory!